Chemicals for protection of plant and removal of plant virus, and producing method thereof

Abstract

This invention relates to a chemical for protection of plants and removal of plant viruses and its producing method, which is applicable to the prevention of viral disease in the fields of agriculture and horticulture. That is, this invention relates to a chemical for protection of plants and removal of plant viruses which contains a plant virus prevention active substance as its effective ingredient and which was cultivated using a fungus selected from the genus Fomes and was produced in fungi or medium.

We claim: 
     
       1. A composition for the protection of plants from viruses which consists essentially of a carrier and polysaccharide F-B, having the following chemical properties, as an effective ingredient: (a) elementary analysis   [high molecular] polysaccharide F-B specimen salt C: 34.8%   H: 5.5%   N: 0.6%   Ash content: 11.6%     [high molecular] polysaccharide F-B specimen C: 37.1%   H: 5.9%   N: 0.5%   ash content: 5.2%     (b) molecular weight range of molecular weights according to the gel filtration method: 7000-17000 daltons   mean molecular weight according to the gel filtration method: 12000 daltons     (c) sugar composition and its constitution glucose: glucuronic acid=3.4:1; wherein said polysaccharide is produced by a fungus selected from the group consisting of Fomes fomentarius IFO 8246, IFO 30371, IFO 30777, ATCC 26708, ATCC 34687, ATCC 46213, FERM BP-2230, Fomes geotropus ATCC 26709, and Fomes melanoporous ATCC 26132.       
     
     
       2. The composition according to claim 1, wherein said fungus is Fomes fomentarius FERM BP-2230. 
     
     
       3. The composition according to claim 1, wherein said polysaccharide has the characteristics as shown in FIGS. 1a-5a. 
     
     
       4. A composition for the protection of plants from viruses which consists essentially of a carrier and polysaccharide F-Ab, having the following chemical properties, as an effective ingredient: (a) elementary analysis   polysaccharide F-Ab specimen salt C: 36.0%   H: 6.0%   N: 0.5%   ash content: 9.0%     polysaccharide F-Ab specimen C: 37.9%   H: 5.9%   N: 0.4%   ash content: 3.9%     (b) molecular weight range of molecular weights according to the gel filtration method: 10000-20000 daltons   mean molecular weight according to the gel filtration method: 15500-16500 daltons     (c) sugar composition and its constitution glucose: glucuronic acid=9:2.0-1.8; wherein said polysaccharide is produced by a fungus selected from the group consisting of Fomes fomentarius IFO 8246, IFO 30371, IFO 30777, ATCC 26708, ATCC 34687, ATCC 46213, FERM BP-2230, Fomes geotropus ATCC 26709, and Fomes melanoporus ATCC 26132.       
     
     
       5. The composition according to claim 4, wherein said polysaccharide has the characteristics as shown in FIGS. 1b-5b. 
     
     
       6. The composition according to claim 4, wherein said fungus Fomes fomentarius FERM BP-2230.